# How Mail Hosting works > What a Mail Hosting service includes, how domains, mailboxes and aliases fit together, and what its Overview tab shows. Source: https://docs.coritan.com/mail/mail-hosting/ In the dashboard: - /dashboard/mail/…/overview: https://www.coritan.com/dashboard/mail A Mail Hosting service gives people mailboxes on your own domain. They read and send mail in a mail app over IMAP and SMTP, over JMAP, or in webmail. You manage everything from the service's panel in the dashboard: go to **Email** and open the service. ## How the parts fit together *Domains* : The names your addresses end in, such as `example.com`. You add a domain, prove you own it and publish its DNS records. See [Add a domain to Mail Hosting](/mail/mail-hosting/add-a-domain/). *Mailboxes* : Addresses that store mail and can sign in, such as `alex@example.com`. Each has its own password and storage quota. See [Create and manage mailboxes](/mail/mail-hosting/mailboxes/). *Aliases* : Extra addresses that deliver to one or more mailboxes on the service, including a catch-all for a whole domain. See [Forward addresses with aliases](/mail/mail-hosting/aliases/). A mailbox or alias can only use a domain on the same service, and the dashboard offers only domains that are verified. Each domain can be on one mail service at a time. ## What the plan sets The plan sets how many mailboxes and domains the service may hold, and how much storage it has. The storage is one pool for the whole service: the number of mailboxes multiplied by the storage per mailbox that the plan lists. Each mailbox takes a share of that pool as its quota. A new mailbox gets an equal share by default, and you can give one mailbox more and another less, as long as the quotas together fit in the pool. The smallest quota is 100 MB. Aliases do not count against the plan. To get more mailboxes, domains or storage, see [Move to a bigger or smaller plan](/mail/billing/#move-to-a-bigger-or-smaller-plan). ## What the Overview tab shows In the dashboard, go to **Email**, open the service, then the **Overview** tab. The four figures at the top show **Storage**, **Mailboxes** and **Domains** used against the plan, and the number of **Aliases**. **Mail server addresses** : The names to enter in a mail app: **SMTP** (ports 587 with STARTTLS and 465 with TLS), **IMAP** (port 993 with TLS) and **JMAP** (port 443). It also shows the **Webmail** address and the **MX suffix**, which ends the `mx1`, `mx2` names your domains' MX records point to. **Mail client setup** : The settings a mail app asks for, in the order it asks. See [Connect a mail app](/mail/mail-hosting/connect-a-mail-app/). **Recent activity** : The latest delivery events from the last seven days, such as delivered, bounced or deferred messages. **Service** : The service's **Status**, **Plan**, **Region**, the date it **Renews**, when it was **Created** and its **Service ID**. When we pause the service's sending, the status reads **Sending paused**. **Tags** : Labels you add to find the service. See [Tags](/get-started/tags/). **Domains** : Each domain and its verification status. Select one to open its DNS records. The panel header has **Open webmail**, which opens the webmail address in a new tab, and **Order another**, which opens the Mail Hosting order page for a second service. ## Sending from a mailbox A mailbox sends through the service's SMTP server after it signs in. The rules that apply to every mail service apply to it too: - The From address must be on a domain of the service that has passed its ownership check. - A recipient on the service's suppression list is refused with `Recipient … is suppressed after a bounce or complaint`. Bounces and spam complaints add addresses to it. - The service has an hourly sending limit, `rate_per_hour` in the [service summary](#with-the-api). Mail over it waits in the queue and goes out in a later hour. - We watch each service's bounce and complaint rates. When they cross the pause threshold, we pause the service and the panel shows **Sending is paused**. Until our staff lift the pause, its mailboxes cannot sign in, send or receive mail. See [Sending reputation and deliverability](/mail/smtp-relay/deliverability/). To send mail from an application rather than a person, use [SMTP Relay](/mail/smtp-relay/). ## When the service ends When you [cancel the service](/billing/cancel-a-service/) and it ends, we delete its mailboxes, aliases and stored mail. Move anything you want to keep first. ## With the API Read the service summary: ```bash curl https://api.coritan.com/api/v1/client/mail/4812 \ -H "Authorization: Bearer $CORITAN_TOKEN" ``` The fields you need most: `kind` : `hosting` for Mail Hosting. `status` : `active` once the service is ready. `quota_mailboxes`, `quota_domains`, `quota_storage_bytes` : What the plan allows. `quota_storage_bytes` is the whole pool. `counts` : How many of each thing the service holds: `mailbox`, `alias`, `group` and `domains`. `used_bytes` : The storage the mailboxes use. `rate_per_hour` : The service's hourly sending limit. `hostnames` : `smtp_host`, `imap_host` and `jmap_host` for mail apps, `webmail_url`, and `mx_hostname_base`, the MX suffix. `cluster.region` : The region the service runs in. `sending_frozen`, `review_flag`, `reputation_note` : Whether sending is paused or under review, and why. `service` : The service's `id`, `status` and `hostname`. A service that is still being set up answers `409` with `This mail service is still provisioning`. ## API - `GET /api/v1/client/mail/{service_id}`: Get summary (https://docs.coritan.com/api/reference/client/mail/mail/#op-get-api-v1-client-mail-service-id)